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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: MethodAnnotationScanner.html 966 2015-01-28 18:06:10Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.java;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.beans.Introspector;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.lang.annotation.Annotation;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.lang.reflect.InvocationTargetException;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.lang.reflect.Method;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.lang.reflect.Modifier;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.Arrays;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.HashSet;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.Iterator;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.util.LinkedHashMap;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.Set;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>/**<a name="line.21"></a>
<span class="sourceLineNo">022</span> * Scan a class hierarchy for annotated methods in an override-aware manner.<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> * &lt;p&gt;<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Instances find all methods annotated with a specific annotation in a given Java class or any of its superclasses<a name="line.25"></a>
<span class="sourceLineNo">026</span> * and superinterfaces, while also being override-aware, i.e., filtering out annotations on overridden supertype methods<a name="line.26"></a>
<span class="sourceLineNo">027</span> * when the overriding method also has the annotation. This operation is performed by {@link #findAnnotatedMethods}.<a name="line.27"></a>
<span class="sourceLineNo">028</span> * &lt;/p&gt;<a name="line.28"></a>
<span class="sourceLineNo">029</span> *<a name="line.29"></a>
<span class="sourceLineNo">030</span> * &lt;p&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span> * Subclasses may validate the annotations, and control which annotated methods to include and/or reject, by overriding<a name="line.31"></a>
<span class="sourceLineNo">032</span> * {@link #getAnnotation getAnnotation()} and/or {@link #includeMethod includeMethod()}.<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;/p&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span> *<a name="line.34"></a>
<span class="sourceLineNo">035</span> * @param &lt;T&gt; Java type to be introspected<a name="line.35"></a>
<span class="sourceLineNo">036</span> * @param &lt;A&gt; Java annotation type<a name="line.36"></a>
<span class="sourceLineNo">037</span> */<a name="line.37"></a>
<span class="sourceLineNo">038</span>public class MethodAnnotationScanner&lt;T, A extends Annotation&gt; {<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    protected final Class&lt;T&gt; type;<a name="line.40"></a>
<span class="sourceLineNo">041</span>    protected final Class&lt;A&gt; annotationType;<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    /**<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * Constructor.<a name="line.44"></a>
<span class="sourceLineNo">045</span>     *<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @param type Java class to be introspected<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @param annotationType Java annotation type to search for<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * @throws IllegalArgumentException if either parameter is null<a name="line.48"></a>
<span class="sourceLineNo">049</span>     */<a name="line.49"></a>
<span class="sourceLineNo">050</span>    public MethodAnnotationScanner(Class&lt;T&gt; type, Class&lt;A&gt; annotationType) {<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>        // Sanity check<a name="line.52"></a>
<span class="sourceLineNo">053</span>        if (type == null)<a name="line.53"></a>
<span class="sourceLineNo">054</span>            throw new IllegalArgumentException("null type");<a name="line.54"></a>
<span class="sourceLineNo">055</span>        if (annotationType == null)<a name="line.55"></a>
<span class="sourceLineNo">056</span>            throw new IllegalArgumentException("null annotationType");<a name="line.56"></a>
<span class="sourceLineNo">057</span>        this.type = type;<a name="line.57"></a>
<span class="sourceLineNo">058</span>        this.annotationType = annotationType;<a name="line.58"></a>
<span class="sourceLineNo">059</span>    }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>    /**<a name="line.61"></a>
<span class="sourceLineNo">062</span>     * Build set of annotated methods, with overridden annotated methods omitted.<a name="line.62"></a>
<span class="sourceLineNo">063</span>     *<a name="line.63"></a>
<span class="sourceLineNo">064</span>     * @return the set of all annotated methods, with overridden annotated methods removed<a name="line.64"></a>
<span class="sourceLineNo">065</span>     *  when the overriding method is also annotated<a name="line.65"></a>
<span class="sourceLineNo">066</span>     */<a name="line.66"></a>
<span class="sourceLineNo">067</span>    public Set&lt;MethodInfo&gt; findAnnotatedMethods() {<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>        // Find all methods<a name="line.69"></a>
<span class="sourceLineNo">070</span>        final HashSet&lt;MethodInfo&gt; set = new HashSet&lt;MethodInfo&gt;();<a name="line.70"></a>
<span class="sourceLineNo">071</span>        this.findMethodInfos(this.type, set);<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>        // Remove overridden and duplicate methods<a name="line.73"></a>
<span class="sourceLineNo">074</span>        final LinkedHashMap&lt;String, HashSet&lt;MethodInfo&gt;&gt; nameSetMap = new LinkedHashMap&lt;String, HashSet&lt;MethodInfo&gt;&gt;();<a name="line.74"></a>
<span class="sourceLineNo">075</span>    infoLoop:<a name="line.75"></a>
<span class="sourceLineNo">076</span>        for (MethodInfo methodInfo : set) {<a name="line.76"></a>
<span class="sourceLineNo">077</span>            final String name = methodInfo.getMethod().getName();<a name="line.77"></a>
<span class="sourceLineNo">078</span>            final Method method = methodInfo.getMethod();<a name="line.78"></a>
<span class="sourceLineNo">079</span>            HashSet&lt;MethodInfo&gt; nameSet = nameSetMap.get(name);<a name="line.79"></a>
<span class="sourceLineNo">080</span>            if (nameSet == null) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>                nameSet = new HashSet&lt;MethodInfo&gt;();<a name="line.81"></a>
<span class="sourceLineNo">082</span>                nameSetMap.put(name, nameSet);<a name="line.82"></a>
<span class="sourceLineNo">083</span>                nameSet.add(methodInfo);<a name="line.83"></a>
<span class="sourceLineNo">084</span>                continue;<a name="line.84"></a>
<span class="sourceLineNo">085</span>            }<a name="line.85"></a>
<span class="sourceLineNo">086</span>            for (Iterator&lt;MethodInfo&gt; i = nameSet.iterator(); i.hasNext(); ) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>                final Method otherMethod = i.next().getMethod();<a name="line.87"></a>
<span class="sourceLineNo">088</span>                if (MethodAnnotationScanner.overrides(method, otherMethod)) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>                    i.remove();<a name="line.89"></a>
<span class="sourceLineNo">090</span>                    continue;<a name="line.90"></a>
<span class="sourceLineNo">091</span>                }<a name="line.91"></a>
<span class="sourceLineNo">092</span>                if (MethodAnnotationScanner.overrides(otherMethod, method))<a name="line.92"></a>
<span class="sourceLineNo">093</span>                    continue infoLoop;<a name="line.93"></a>
<span class="sourceLineNo">094</span>            }<a name="line.94"></a>
<span class="sourceLineNo">095</span>            nameSet.add(methodInfo);<a name="line.95"></a>
<span class="sourceLineNo">096</span>        }<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span>        // Return result<a name="line.98"></a>
<span class="sourceLineNo">099</span>        final HashSet&lt;MethodInfo&gt; result = new HashSet&lt;MethodInfo&gt;();<a name="line.99"></a>
<span class="sourceLineNo">100</span>        for (HashSet&lt;MethodInfo&gt; nameSet : nameSetMap.values())<a name="line.100"></a>
<span class="sourceLineNo">101</span>            result.addAll(nameSet);<a name="line.101"></a>
<span class="sourceLineNo">102</span>        return result;<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    /**<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * Scan the given type and all its supertypes for annotated methods and add them to the list.<a name="line.106"></a>
<span class="sourceLineNo">107</span>     *<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * @param klass type to scan, possibly null<a name="line.108"></a>
<span class="sourceLineNo">109</span>     * @param set set to add methods to<a name="line.109"></a>
<span class="sourceLineNo">110</span>     */<a name="line.110"></a>
<span class="sourceLineNo">111</span>    protected void findMethodInfos(Class&lt;?&gt; klass, Set&lt;MethodInfo&gt; set) {<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span>        // Stop at null<a name="line.113"></a>
<span class="sourceLineNo">114</span>        if (klass == null)<a name="line.114"></a>
<span class="sourceLineNo">115</span>            return;<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>        // Search methods<a name="line.117"></a>
<span class="sourceLineNo">118</span>        for (Method method : klass.getDeclaredMethods()) {<a name="line.118"></a>
<span class="sourceLineNo">119</span>            final A annotation = this.getAnnotation(method);<a name="line.119"></a>
<span class="sourceLineNo">120</span>            if (annotation == null || !this.includeMethod(method, annotation))<a name="line.120"></a>
<span class="sourceLineNo">121</span>                continue;<a name="line.121"></a>
<span class="sourceLineNo">122</span>            final MethodInfo methodInfo = this.createMethodInfo(method, annotation);<a name="line.122"></a>
<span class="sourceLineNo">123</span>            if (methodInfo != null)<a name="line.123"></a>
<span class="sourceLineNo">124</span>                set.add(methodInfo);<a name="line.124"></a>
<span class="sourceLineNo">125</span>        }<a name="line.125"></a>
<span class="sourceLineNo">126</span><a name="line.126"></a>
<span class="sourceLineNo">127</span>        // Recurse on interfaces<a name="line.127"></a>
<span class="sourceLineNo">128</span>        for (Class&lt;?&gt; iface : klass.getInterfaces())<a name="line.128"></a>
<span class="sourceLineNo">129</span>            this.findMethodInfos(iface, set);<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span>        // Recurse on superclass<a name="line.131"></a>
<span class="sourceLineNo">132</span>        this.findMethodInfos(klass.getSuperclass(), set);<a name="line.132"></a>
<span class="sourceLineNo">133</span>    }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>    /**<a name="line.135"></a>
<span class="sourceLineNo">136</span>     * Get the annotation on the given method.<a name="line.136"></a>
<span class="sourceLineNo">137</span>     *<a name="line.137"></a>
<span class="sourceLineNo">138</span>     * &lt;p&gt;<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * The implementation in {@link MethodAnnotationScanner} just invokes {@code method.getAnnotation()}.<a name="line.139"></a>
<span class="sourceLineNo">140</span>     * Subclasses may override to automatically synthesize annotations, etc.<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * &lt;/p&gt;<a name="line.141"></a>
<span class="sourceLineNo">142</span>     *<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * @param method method in question<a name="line.143"></a>
<span class="sourceLineNo">144</span>     * @return annotation for {@code method}, or null if there is none<a name="line.144"></a>
<span class="sourceLineNo">145</span>     */<a name="line.145"></a>
<span class="sourceLineNo">146</span>    protected A getAnnotation(Method method) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>        return method.getAnnotation(this.annotationType);<a name="line.147"></a>
<span class="sourceLineNo">148</span>    }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>    /**<a name="line.150"></a>
<span class="sourceLineNo">151</span>     * Determine whether the annotated method should be included.<a name="line.151"></a>
<span class="sourceLineNo">152</span>     *<a name="line.152"></a>
<span class="sourceLineNo">153</span>     * &lt;p&gt;<a name="line.153"></a>
<span class="sourceLineNo">154</span>     * The implementation in {@link MethodAnnotationScanner} returns true if {@code method} takes zero parameters<a name="line.154"></a>
<span class="sourceLineNo">155</span>     * and returns anything other than void, otherwise false.<a name="line.155"></a>
<span class="sourceLineNo">156</span>     * &lt;/p&gt;<a name="line.156"></a>
<span class="sourceLineNo">157</span>     *<a name="line.157"></a>
<span class="sourceLineNo">158</span>     * &lt;p&gt;<a name="line.158"></a>
<span class="sourceLineNo">159</span>     * Subclasses may apply different tests and optionally throw an exception if a method is improperly annotated.<a name="line.159"></a>
<span class="sourceLineNo">160</span>     * &lt;/p&gt;<a name="line.160"></a>
<span class="sourceLineNo">161</span>     *<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * @param method method to check<a name="line.162"></a>
<span class="sourceLineNo">163</span>     * @param annotation method's annotation<a name="line.163"></a>
<span class="sourceLineNo">164</span>     * @throws RuntimeException if method is erroneously annotated<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * @return true to include method, false to ignore it<a name="line.165"></a>
<span class="sourceLineNo">166</span>     */<a name="line.166"></a>
<span class="sourceLineNo">167</span>    protected boolean includeMethod(Method method, A annotation) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>        return method.getReturnType() != void.class &amp;&amp; method.getParameterTypes().length == 0;<a name="line.168"></a>
<span class="sourceLineNo">169</span>    }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>    /**<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * Determine if one method strictly overrides another.<a name="line.172"></a>
<span class="sourceLineNo">173</span>     *<a name="line.173"></a>
<span class="sourceLineNo">174</span>     * @param override possible overriding method (i.e., subclass method)<a name="line.174"></a>
<span class="sourceLineNo">175</span>     * @param original possible overriding method (i.e., superclass method)<a name="line.175"></a>
<span class="sourceLineNo">176</span>     * @return true if {@code override} overrides {@code original}, otherwise false;<a name="line.176"></a>
<span class="sourceLineNo">177</span>     *  if {@code override} equals {@code original}, false is returned<a name="line.177"></a>
<span class="sourceLineNo">178</span>     */<a name="line.178"></a>
<span class="sourceLineNo">179</span>    public static boolean overrides(Method override, Method original) {<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
<span class="sourceLineNo">181</span>        // Check class hierarchy<a name="line.181"></a>
<span class="sourceLineNo">182</span>        if (!original.getDeclaringClass().isAssignableFrom(override.getDeclaringClass())<a name="line.182"></a>
<span class="sourceLineNo">183</span>          || original.getDeclaringClass() == override.getDeclaringClass())<a name="line.183"></a>
<span class="sourceLineNo">184</span>            return false;<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span>        // Compare names<a name="line.186"></a>
<span class="sourceLineNo">187</span>        if (!original.getName().equals(override.getName()))<a name="line.187"></a>
<span class="sourceLineNo">188</span>            return false;<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span>        // Check staticness<a name="line.190"></a>
<span class="sourceLineNo">191</span>        if ((original.getModifiers() &amp; Modifier.STATIC) != 0 || (override.getModifiers() &amp; Modifier.STATIC) != 0)<a name="line.191"></a>
<span class="sourceLineNo">192</span>            return false;<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>        // Compare (raw) parameter types<a name="line.194"></a>
<span class="sourceLineNo">195</span>        if (!Arrays.equals(original.getParameterTypes(), override.getParameterTypes()))<a name="line.195"></a>
<span class="sourceLineNo">196</span>            return false;<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>        // Done<a name="line.198"></a>
<span class="sourceLineNo">199</span>        return true;<a name="line.199"></a>
<span class="sourceLineNo">200</span>    }<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span>    /**<a name="line.202"></a>
<span class="sourceLineNo">203</span>     * Create a new {@link MethodInfo} instance corresponding to the given annotated method.<a name="line.203"></a>
<span class="sourceLineNo">204</span>     *<a name="line.204"></a>
<span class="sourceLineNo">205</span>     * &lt;p&gt;<a name="line.205"></a>
<span class="sourceLineNo">206</span>     * The implementation in {@link MethodAnnotationScanner} just instantiates a {@link MethodInfo} directly.<a name="line.206"></a>
<span class="sourceLineNo">207</span>     * &lt;/p&gt;<a name="line.207"></a>
<span class="sourceLineNo">208</span>     *<a name="line.208"></a>
<span class="sourceLineNo">209</span>     * @param method the method<a name="line.209"></a>
<span class="sourceLineNo">210</span>     * @param annotation the annotation annotating the method<a name="line.210"></a>
<span class="sourceLineNo">211</span>     */<a name="line.211"></a>
<span class="sourceLineNo">212</span>    protected MethodInfo createMethodInfo(Method method, A annotation) {<a name="line.212"></a>
<span class="sourceLineNo">213</span>        return new MethodInfo(method, annotation);<a name="line.213"></a>
<span class="sourceLineNo">214</span>    }<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span>    /**<a name="line.216"></a>
<span class="sourceLineNo">217</span>     * Holds information about an annotated method detected by a {@link MethodAnnotationScanner}.<a name="line.217"></a>
<span class="sourceLineNo">218</span>     *<a name="line.218"></a>
<span class="sourceLineNo">219</span>     * @see MethodAnnotationScanner#findAnnotatedMethods<a name="line.219"></a>
<span class="sourceLineNo">220</span>     */<a name="line.220"></a>
<span class="sourceLineNo">221</span>    public class MethodInfo {<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>        private final Method method;<a name="line.223"></a>
<span class="sourceLineNo">224</span>        private final A annotation;<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span>        public MethodInfo(Method method, A annotation) {<a name="line.226"></a>
<span class="sourceLineNo">227</span>            if (method == null)<a name="line.227"></a>
<span class="sourceLineNo">228</span>                throw new IllegalArgumentException("null method");<a name="line.228"></a>
<span class="sourceLineNo">229</span>            if (annotation == null)<a name="line.229"></a>
<span class="sourceLineNo">230</span>                throw new IllegalArgumentException("null annotation");<a name="line.230"></a>
<span class="sourceLineNo">231</span>            this.method = method;<a name="line.231"></a>
<span class="sourceLineNo">232</span>            this.annotation = annotation;<a name="line.232"></a>
<span class="sourceLineNo">233</span>            try {<a name="line.233"></a>
<span class="sourceLineNo">234</span>                this.method.setAccessible(true);<a name="line.234"></a>
<span class="sourceLineNo">235</span>            } catch (SecurityException e) {<a name="line.235"></a>
<span class="sourceLineNo">236</span>                // ignore<a name="line.236"></a>
<span class="sourceLineNo">237</span>            }<a name="line.237"></a>
<span class="sourceLineNo">238</span>        }<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span>        /**<a name="line.240"></a>
<span class="sourceLineNo">241</span>         * Get the annotated method.<a name="line.241"></a>
<span class="sourceLineNo">242</span>         *<a name="line.242"></a>
<span class="sourceLineNo">243</span>         * @return annotated method taking zero parameters and returning non-void<a name="line.243"></a>
<span class="sourceLineNo">244</span>         */<a name="line.244"></a>
<span class="sourceLineNo">245</span>        public Method getMethod() {<a name="line.245"></a>
<span class="sourceLineNo">246</span>            return this.method;<a name="line.246"></a>
<span class="sourceLineNo">247</span>        }<a name="line.247"></a>
<span class="sourceLineNo">248</span><a name="line.248"></a>
<span class="sourceLineNo">249</span>        /**<a name="line.249"></a>
<span class="sourceLineNo">250</span>         * Get the method annotattion.<a name="line.250"></a>
<span class="sourceLineNo">251</span>         */<a name="line.251"></a>
<span class="sourceLineNo">252</span>        public A getAnnotation() {<a name="line.252"></a>
<span class="sourceLineNo">253</span>            return this.annotation;<a name="line.253"></a>
<span class="sourceLineNo">254</span>        }<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span>        /**<a name="line.256"></a>
<span class="sourceLineNo">257</span>         * Get the Java bean property name implied by this method's name, if any.<a name="line.257"></a>
<span class="sourceLineNo">258</span>         *<a name="line.258"></a>
<span class="sourceLineNo">259</span>         * @throws IllegalArgumentException if the method's name does not follow Java bean conventions<a name="line.259"></a>
<span class="sourceLineNo">260</span>         */<a name="line.260"></a>
<span class="sourceLineNo">261</span>        public String getMethodPropertyName() {<a name="line.261"></a>
<span class="sourceLineNo">262</span>            final String name = this.method.getName();<a name="line.262"></a>
<span class="sourceLineNo">263</span>            if (name.startsWith("get") &amp;&amp; name.length() &gt; 3)<a name="line.263"></a>
<span class="sourceLineNo">264</span>                return Introspector.decapitalize(name.substring(3));<a name="line.264"></a>
<span class="sourceLineNo">265</span>            if (name.startsWith("is") &amp;&amp; name.length() &gt; 2 &amp;&amp; Primitive.get(method.getReturnType()) == Primitive.BOOLEAN)<a name="line.265"></a>
<span class="sourceLineNo">266</span>                return Introspector.decapitalize(name.substring(2));<a name="line.266"></a>
<span class="sourceLineNo">267</span>            throw new IllegalArgumentException("can't infer property name from non-Java bean method " + this.method);<a name="line.267"></a>
<span class="sourceLineNo">268</span>        }<a name="line.268"></a>
<span class="sourceLineNo">269</span><a name="line.269"></a>
<span class="sourceLineNo">270</span>        /**<a name="line.270"></a>
<span class="sourceLineNo">271</span>         * Invoke the method and return the result. Any checked exception thrown is rethrown after being wrapped<a name="line.271"></a>
<span class="sourceLineNo">272</span>         * in a {@link RuntimeException}.<a name="line.272"></a>
<span class="sourceLineNo">273</span>         *<a name="line.273"></a>
<span class="sourceLineNo">274</span>         * @return result of invoking method<a name="line.274"></a>
<span class="sourceLineNo">275</span>         * @throws RuntimeException if invocation fails<a name="line.275"></a>
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<span class="sourceLineNo">277</span>        public Object invoke(T obj, Object... params) {<a name="line.277"></a>
<span class="sourceLineNo">278</span>            try {<a name="line.278"></a>
<span class="sourceLineNo">279</span>                return this.method.invoke(obj, params);<a name="line.279"></a>
<span class="sourceLineNo">280</span>            } catch (InvocationTargetException e) {<a name="line.280"></a>
<span class="sourceLineNo">281</span>                if (e.getCause() instanceof RuntimeException)<a name="line.281"></a>
<span class="sourceLineNo">282</span>                    throw (RuntimeException)e.getCause();<a name="line.282"></a>
<span class="sourceLineNo">283</span>                if (e.getCause() instanceof Error)<a name="line.283"></a>
<span class="sourceLineNo">284</span>                    throw (Error)e.getCause();<a name="line.284"></a>
<span class="sourceLineNo">285</span>                throw new RuntimeException(e.getCause());<a name="line.285"></a>
<span class="sourceLineNo">286</span>            } catch (IllegalAccessException e) {<a name="line.286"></a>
<span class="sourceLineNo">287</span>                throw new RuntimeException(e);<a name="line.287"></a>
<span class="sourceLineNo">288</span>            }<a name="line.288"></a>
<span class="sourceLineNo">289</span>        }<a name="line.289"></a>
<span class="sourceLineNo">290</span><a name="line.290"></a>
<span class="sourceLineNo">291</span>        @Override<a name="line.291"></a>
<span class="sourceLineNo">292</span>        public boolean equals(Object obj) {<a name="line.292"></a>
<span class="sourceLineNo">293</span>            if (obj == null || obj.getClass() != this.getClass())<a name="line.293"></a>
<span class="sourceLineNo">294</span>                return false;<a name="line.294"></a>
<span class="sourceLineNo">295</span>            final MethodAnnotationScanner&lt;?, ?&gt;.MethodInfo that = (MethodAnnotationScanner&lt;?, ?&gt;.MethodInfo)obj;<a name="line.295"></a>
<span class="sourceLineNo">296</span>            return this.method.equals(that.method) &amp;&amp; this.annotation.equals(that.annotation);<a name="line.296"></a>
<span class="sourceLineNo">297</span>        }<a name="line.297"></a>
<span class="sourceLineNo">298</span><a name="line.298"></a>
<span class="sourceLineNo">299</span>        @Override<a name="line.299"></a>
<span class="sourceLineNo">300</span>        public int hashCode() {<a name="line.300"></a>
<span class="sourceLineNo">301</span>            return this.method.hashCode() ^ this.annotation.hashCode();<a name="line.301"></a>
<span class="sourceLineNo">302</span>        }<a name="line.302"></a>
<span class="sourceLineNo">303</span>    }<a name="line.303"></a>
<span class="sourceLineNo">304</span>}<a name="line.304"></a>
<span class="sourceLineNo">305</span><a name="line.305"></a>




























































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